• BST Time to S Time Converter

    GMT = UTC + 00:00

    23:53:11

    Monday, December 15, 2025

    S = UTC - 06:00

    17:53:11

    Monday, December 15, 2025

    GMT(Greenwich Mean Time) and S(Sierra Time Zone) Mapping Table
    Greenwich Mean Time(GMT)Sierra Time Zone(S)
    00:0018:00-1 day
    01:0019:00-1 day
    02:0020:00-1 day
    03:0021:00-1 day
    04:0022:00-1 day
    05:0023:00-1 day
    06:0000:00
    07:0001:00
    08:0002:00
    09:0003:00
    10:0004:00
    11:0005:00
    12:0006:00
    13:0007:00
    14:0008:00
    15:0009:00
    16:0010:00
    17:0011:00
    18:0012:00
    19:0013:00
    20:0014:00
    21:0015:00
    22:0016:00
    23:0017:00

    GMT(Greenwich Mean Time)

    Greenwich Mean Time(GMT) has no offset from Coordinated Universal(UTC) Time.

    Typical City of GMT (Greenwich Mean Time)

    United Kingdom - London (Winter)
    Iceland - Reykjavik (All Year)
    Sierra Leone - Freetown (All Year)
    Greenland - Danmarkshavn (All Year)
    Antarctica - Troll Station (Summer)

    S(Sierra Time Zone)

    Sierra Time Zone(S) is 06:00 hours behind Coordinated Universal(UTC) Time.

    Typical City of S (Sierra Time Zone)

    Costa Rica - San Jose (All Year)